C++ provides implicit conversion from T * to const T *.If I use T * within a container class now, like in vector<T *>, then there is of course no implicit conversion to vector<const T *> anymore.
My understanding is generic types are invariant, so if we have B as a subtype of A, then List<B> has no relationship with List<A>. So casting won't work on List<A> and List<B>.
From my prerequisites, generic types are invariant, so I can say if we have B subtype of A, then List<B> has no relationship with List<A>. So casting won't work on List<A> and List<B>
Horse is a struct which implements the Animal trait. I have an Rc<Horse> and a function that needs to take in an Rc<Animal>, so I want to convert from Rc<Horse> to Rc<Animal>.
I am using java 8.I recently came across this:This does not throw a java.lang.ClassCastException. Why is that?
I have an abstract Event class which has an abstract method:This method should check if two instances of an Event subclass intersect based on the instance variables of the particular subclass. I want to force any subclass of Event to override the method on its instance variables. What is the...
I stumbled on a function that I think is unnecessary, and generally scares me:Which is then used like this:
I have a simple foo class, and I am able to cast to a collection interface (either Map or List) without any compiler error.
I have two classes:In a method which should returns an object of type Table, I try to filter an object of type Table with the Where-Statement and return this object after filtering.
This is a follow up to this other question about memory re-use. As the original question was about a specific implementation, the answer was related to that specific implementation.